*{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
}
a{
    text-decoration: none;
}

#outer{
    width:600px;
    height:300px;
    margin:100px auto;
    position: relative;
}
#outer #wrapper{
    width:600px;
    height:300px;
}
#outer #wrapper img{
    position: absolute;
    left:0;
    top:0;
    width:100%;
    height:100%;
    display: none;
}
#outer #wrapper img:nth-child(1){
    display: block;
}
#outer ul{
    width:150px;
    height:30px;
    position: absolute;
    bottom: 10px;
    left:50%;
    margin-left: -75px;
}
#outer ul li{
    width:25px;
    height: 25px;
    border-radius: 50%;
    margin-right: 5px;
    background: pink;
    float: left;
}
#outer ul li.select{
    background: red;
}
#outer a{
    display: inline-block;
    width:20px;
    height:40px;
    background: black;
    line-height: 40px;
    text-align: center;
    color:white;
    font-size: 20px;
    position: absolute;
    top:50%;
    margin-top:-20px;
}
#outer #right{
    right:0;
}